Adjustable scaffold.



G'. JOHNSON.

ADJUSTABLE SOAFFDLD. APPLICATION rILnD rg. 3,1912.

. 1,035,595. Patented Aug. 13,1912.

3 SHEETS-SHEET 1.

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? 44 5l "Y I Z 25B ATTORNEY G. JOHNSON.

ADJUSTABLE SOAFFOLD. APPLmATIoN FILED 211B. a, '1012.

1,085,595. I Patnted Aug. 13,1912.

S SHEETS-SHEET 2.

G. JOHNSON.

ADJUSTABLE SOAFFOLD.. APPLICATION FILED 1113.3, 1912.

` 1,035,595. Patented Aug. 13, 1912.

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GUSTAV JOHNSON, F CLEVELAND, OHIO.

ADJUSTABLE SCAFFOLD.

Speccation of Letters Patent.

Patented Aug. 13, 1912.

Application led February 3, 1912. Serial No. 675,319.

To all whom it may concern Be it known that I, GUsTAv JOHNSON,

citizen of the United States, residing at- Cleveland, in the county ofCuyahoga and State of Ohio, have invented certain new l and useful Imrovements in Adjustable tures, the scaffold being mounted within thestructure, and capable of being raised as the work progresses.

The apparatus comprises an upper part or superstructure which can beraised or lowered by means of screw rods connected thereto and to asupport below, theIl support being mounted on four (more or less) posts,which are built` up as the upper structure is raised. The upperstructure also includes special devices for supporting the workingplatform, and for centering and holding the superstructure in placewithin the chimney or furnace.

In the drawings,-Figure 1 is a side elevation of the scaffold. Fig. 2 isa top plan. Fig. 3 is an enlarged detail of part of the upper structure.Fig. 4 is a detail in side elevation of one of thecentering devices.

Fig. 5 is a perspective View of a section of one of the posts.

Referring specifically to the drawings 12 indicates a ring or frame,preferably made of angle iron, and forming the bottom member of thesuperstructure which supports the platform, and this is connected byuprights 10 to an upper ringer frame 30. A series of brackets arepivotally mounted on these frames, to swing in or out or expand orcontract, to acfcommodate the scaffold to the structure being built, andto support the platform on which the workmen stand, at the tcp. Eachbracket consists of a lower inclined arm 9 and an upper horizontal arm32. The 4 former is pivoted at its lower end to a lug 33 projecting fromthe lower ring 12, and the latter is pvotally hooked at its inner endinto a lug or eye 34, projecting from the upper member 30, and the arms9 and 32 are fastened together at the outer end of the latter, asindicated at 35, and the bracket thus formed will swing on a verticalpivot in or. out. The upper ends of the respective arms 9 of thebrackets are connected by links 16, having slts 17 through which theends of the arms 9 project, so that the various brackets are coupledtogether.

For swinging the brackets in or out they are divided into several sets,each comprising four, more or less, and each set is operated by a lever10 fulcrumed on one of the uprights 10,` and connected to a plate 11which is ided by a pin 14 projecting from the uprlght 1() and through aslot 13 in the plate 11. The plate 11 is fastened to a bar 15 which canslide on the frame 12. This bar 15 is connected .by pins 18 to shortcrank arms 25 projecting from the members 9 of the brackets, the cranks25 being fastened to the arms 9, a short distanceabove the pivoted lugs33 and the pins`18 working in slots in said cranks 25. Thereby, when thelever 10LL swings the plate 15 will be shifted one way or the other, andby means of the crank connections to the bracket members 9, therespective brackets will be adjusted or swung in or out to the desiredextent. The outer ends of the boards 36, forming the u per or workingplatform, rest on the link on the upper frame 30, and these boards maybe set in place after the supports are ad'usted. l or centering thedevice in the chimney or furnace, and preventing any slip, I provide anumber of levers 6 which are pivotally connected at 6 to the lower ring12, and extend therefrom upwardly and outwardly at an incline, and theupper ends of these levers carry hinged blocks 7 of rubber or similarmaterial. Each lever may be adjusted topress the blocks against theinner surface of the chimney by means of' a screw 40 operated by a nut41 rotatably connected to a block 42 which is pivoted at 43 to a bracket44 fastened to one of the uprights 10. The pivoted block 7 accommodatesitself to any inclination of the surface against which it is pressed.

The--hoisting devices are mounted on the superstructure by means ofcross beams or pieces 46 fastened to post sectins 23b which support saidsuperstructure, by vsuitalilc brackets or connections some of which are'indicated at 47. The gear 19 is driven by a motor 48, and meshes. withpinions 19 on shafts 20 which have worms 20 at opposite ends meshingwith worm gear nuts 21 which travel on screws 21, the nuts being set insuitable castings 50 fastened to the beams 46,

s A16, and their inner ends site sides,

l Ithe like.

' place.

so that as tbe. nuts are raised "or lowered the said beams and thesuperstructure connected..

thereto will also be raised'or lowered. 'llie lower ends of the screws2l are lrigidly supported by ars 26 at top and bottom, and the lowerbars 26 are formed with brackets 22 suitable for bolting tothe plates 23of the posts. These posts are made 'of sections comprising said'plates23?, andangle irons 23a on oppo the. various parts being of differentlengths, sa four and eight feet, to brea k joints every our feet,assuming that the screws willlift four feet, more or less, each time. Aplatform 60 may be supported on the'posts, under the superstructure, toprotect workmen below from falling bricks or 'To raise the top orsuperstructure of the scaffold the inotor will be started' to cause thenuts 21 vto turn in proper direction to travel up the screws, theholding devices f2 being lirst s wun .in out of Contact with thewallThis will cause the upper part of 25.

the structure to be raised. When the nuts reach the upper ends of the.screws, the motor is stopped, and the posts are then built up by theaddition of pieces 23until support. lthe sections 23", lthe addedlengths being suitably bolted or fastened in races 22`to the posts areremoved,`and by reversing vthe motor the screws 2l and means of .posts Xand platforms will enable a workman .to get at frames 26 are lifted acorresponding distance, after which the. brackets 22 are again bolted tothe posts, ready for the next lift.\

lifted step by up 'to support Thus the upper structure is step and theposts are built the same, as the work progresses; and by reverseoperation the structure. may be ytaken down.

By puttingI .a man at leach lever 10a the brackets may bey shiftedsimultaneously,

.around the platform. lf the bore of the chimney or structure beingbuilt is symmet# rical one adjustment will do. for the whole thing, lfAit is varied in size the 4lnackets 9 may be swungV in or outaccordingly.

For special purposes, platforms Z may be supported `upon thesuperstructure, by brackets..`l.l These the top and outer edge. of-astack or--furnace For inside work,vas in relining a fur-1 stidened bybraces Y 'fromthe' posts nace, these platforms and^brackets will beremoved.4 .Also, the lower posts may be S, .designed to extend v to.contact with the wall of the. structure being built, These braces maybeused or not as necessary. although the above specication refers to amotor for drii'ning1 the hoisting gear, it is to -be understood; thatthe hoisting devices sleeve pillars 51 lwith cross brace.

. fold may be Then, the bolts which connect the -Furthermore,

incassa .may be operated by hand and no limitation in this respect isimplied.

The scaffold will preferably be built with two shafts for elevators, oneonv each side of the center of the scaffold. Suitable safety p' ladders(not shown) will also be'provided.

What l claim as new is:

l. ln a scaiiold, the combination of supporting posts, set at corners toform an area therebetween, a` platform supporting structure mounted uponthe posts, hoisting screws between the posts and the said structure,supports for said screws lon said posts, and located within said area,4whereby the scafrneans carried by saidstructure and acting upon thescrews to raise said structure', whereby additional post members vmay beadded, said screws being Yconnected to said supports to lift the same,by turning the screws, to new position with respect to posts, foranother operation.

2. ln a scaold, the combination of a.

frame, a

plurality of platform-supporting brackets ivotally connected atintervals to the perip ery ofl said frame and arranged to swing in orout, horizontally, toward or from said frame, and means to swing'thebrackets in or out. I

.` 3'. ln a scaold, the combination .of a

ivo'ted to frame, a plurality of brackets ge of said swing horizontallyat the outer e erected in a stack or the like,

the

frame, and connecting links between the brackets;

4. ln-a scaiold, the combination. of a supporting frame, a plurality ofplatform-supporting brackets pivoted.l at the outer edge vof said frameto swing in or out horizontally, connections between. said brackets, to

swing the same simultaneously, and means connected to said brackets toturn the vsame on their pivots.

'5. lin a scaffold, the combination of a supporting ytraine,bracketspivoted at the outer edge of said yframe to swing horizontally towardand from the same, a crank connected to one of the brackets, and a leveroperatively connected tothe crank, for'the purpose described. y

6. The combination of posts, a platformsupporting superstructureverticallyadjustable thereon, vertically-swinging levers pivoted to saidsuperstructure, blocks pivoted to the outer ends of the levers, andmeans to swingthe levers outwardly, to press the blocks against the wallof a structurebeing built. y

ico

ln testimony whereof, I do aihx my signature in presence of twowitnesses.

GUSTAV JOHNSON.

Witnesses: Y

JOHN A. BOMMHARDT, STEDMAN J. Rookwnnr...

@spiesof-thlspatentmey be obtained for ve cents each, by addressing theCommissioner o Patents, Washington, D. (2. o

